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Slew bearings, at their core, are large-diameter bearings designed to handle heavy axial, radial, and moment loads while enabling smooth and controlled rotation.
Slew bearings, also known as slewing rings or turntable bearings, are large-diameter bearings designed to handle heavy axial, radial, and moment loads while enabling smooth and controlled rotation. They are used in a variety of heavy-duty applications, including electric arc furnaces, ladle turrets, and caster turrets. Slew bearings must be able to withstand extreme temperatures, heavy loads, and low speeds. They must also be highly reliable, as unscheduled downtime can cost thousands of dollars per hour.
The life of slew bearings is a challenging one. They must sit for long periods of time, waiting for their chance to spring into action. When that time comes, the bearings must pivot on an axis and rotate a heavy load very slowly, 90 or 180 degrees. Once they have completed this task, they wait a long while, 30 or 45 minutes typically, before being called upon once again. Slewing bearings do a lot of sitting around, yet they must respond every time, and they must do it reliably for years on end. So they have to be well-made.
Timing is everything in metalmaking, and if the parts do not run in order with precision, messes get made. They are big, hot, expensive messes, so the parts need to be reliable. In an electric arc furnace, temperatures can reach 2,500 degrees Fahrenheit and slew bearings are counted upon to rotate thousands of tons of molten steel. NSK slew bearings come optimized for the application, maintaining stability and precision under high temperatures, heavy loads, and low speeds. Lubrication features – designed to accommodate customers’ systems – facilitate grease replenishment to reduce friction and wear with a clean supply of lubricant. Seal and shield options promote long-life reliability, an essential prerequisite in these applications. That is of vital importance because any unscheduled downtime can cost thousands of dollars an hour in lost work.
Design features
High-capacity, triple-row roller bearing design (typical)
With segmented steel cage (additional options available)
With internal, external, or no integrated gearing
Various standard or custom seal/shield options
Lubrication features to customer specification
Outer diameter range of 1 to 6 meters
Ball bearing and combined ball/roller bearing slewing rings are also available
Maintaining slew bearings
While inventory management to avoid untimely shortage of such important bearings is standard practice, proper handling goes well beyond simply keeping them in stock. Improperly stored slewing rings can be impacted with corrosion damage, challenging their suitability for operation and presenting the prospect of extended downtime for costly bearing reconditioning.
Proper maintenance of bearings is essential to ensure long life and reliability. This includes disassembly and tank storage of all components, ongoing condition monitoring with visual inspection and oil sampling, assembly and installation, and anticipation of end of life and timely replacement.
Proper maintenance of bearings can save mills hundreds of thousands of dollars from reduced downtime. It can also improve productivity and efficiency and reduce the number of times the bearings need maintenance over their life span.
Overall, slew bearings are critical components in heavy-duty applications, and their proper design, installation, and maintenance are essential to ensure reliable operation and extended service life.
(https://thebossmagazine.com)
More About KYOCM:
Located in industrial area of the Zhaozhuang Industry Park in Linqing, Shandong, Kaiyou Bearings Co., Ltd. is a professional bearing manufacturer and exporter with nearly 20-year experience. The products have reached the international advanced level with advanced production technology and modernized measuring management. Products are widely used in electrical and mechanical trades, the farm machinery industry, the automobile industry and all kinds of transmission facility manufacturing extensively. The products have a good sale in domestic and international dozens of country or region. Companies with the “integrity-based, quality firs” as the operational concept.
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KYOCM tapered roller bearing adopts outer ring and inner ring components. The outer ring is composed of an outer ring, and the cone assembly is composed of an inner ring, a roller and a cage. This bearing structure can withstand combined loads and provide low friction during operation. Rigid bearing applications can be achieved by adjusting a single row tapered roller bearing to a second tapered roller bearing and applying preload. KYOCM tapered roller bearings include single row tapered roller bearing, double row tapered roller bearing and four row tapered roller bearing.
For dimensions and specifications, contact us now:
Add: No.57 Youzhuang Commerial Street Zhaozhuang industry Garden Linqing City Shandong China
Tel: 0086-635-2632030
Fax: 0086-635-2632918
Email: yobearing@hotmail.com
Web: www.kyocm.com
2023-12-29